English: Central part of a large floor mosaic, from a Roman villa in Sentinum (now known as Sassoferrato, in Marche, Italy), ca. 200–250 C.E. Aion, the god of eternity, is standing inside a celestial sphere decorated with zodiac signs, in between a green tree and a bare tree (summer and winter, respectively). Sitting in front of him is the mother-earth goddess, Tellus (the Roman counterpart of Gaia) with her four children, who possibly represent the four seasons.

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